All-fiber low mode beam combiner for high power and high beam quality

A low mode beam combiner ( 10 ) including individual entry fibers ( 12 ) that maintain a low mode operation, an exit fiber ( 16 ), and a spliced section ( 14 ) including a bundle of spliced entry fibers ( 12 ), in which a bundle diameter is reduced to a LMA (large mode area) core of the exit fiber ( 16 ).

Coupling Arrangement for Non-Axial Transfer of Electromagnetic Radiation

A coupling arrangement according to the present invention comprises a target fiber, at least one feeding fiber and an intermediate fiber. The intermediate fiber comprises an input end and a converging taper portion, wherein the input end of the intermediate fiber is spliced to an output end of the feeding fiber in an axial way. Due to this coupling electromagnetic radiation being fed through the feeding fiber enters the intermediate fiber through its input end surface. The converging taper portion of the intermediate fiber is fused to the target fiber in the transfer region in a non-axial way. This leads to a non-axial coupling such that electromagnetic radiation, which entered the intermediate fiber through the input end surface thereof, is coupled into the target fiber.

Method for manufacturing a coupling arrangement, coupling arrangement and amplifier

A single-mode fiber with certain parameters into the core of another fiber with different parameters; in particular single-mode guided light of a shorter wavelength is coupled into the core of a fiber which is a single-mode fiber at a longer wavelength but acts as multimode fiber for the shorter wavelength. Fabrication involves use of a model to determine a length of a pre-taper.

OPTICAL WAVEGUIDE DEVICE AND A MANUFACTURING METHOD FOR AN OPTICAL WAVEGUIDE DEVICE

To reduce the wavelength dependence of the phase difference given to the lightwaves traveling through the optical waveguide arms of a coherent mixer, the optical waveguide device includes a first optical branching device branching a first input light and outputting to a first and a second optical waveguides, a second optical branching device branching a second input light and outputting to a third and a fourth optical waveguides, a first optical coupler that mixes lightwaves travelling through the first and the third optical waveguides, and then branches and outputs a first and a second output lights, a second optical coupler that mixes the lightwaves which travel through the second and the fourth optical waveguides, and then branches and outputs a third and a fourth output lights. Here optical path lengths are mutually equal between the first and the second optical waveguides, and between the third and the fourth optical waveguides. 1. An optical waveguide device comprising:a first optical branching device that branches a first input light and outputs to a first and a second optical waveguides,a second optical branching device that branches a second input light and outputs to a third and a fourth optical waveguides,a first optical coupler that mixes lightwaves which travels through said first and third optical waveguides, and then branches and outputs a first and a second output lights,a second optical coupler that mixes the lightwave which travels through said second and fourth optical waveguides, and then branches and outputs third and fourth output lights,wherein optical path lengths are mutually equal between said first and second optical waveguides, and between said third and fourth optical waveguides,said first optical branching device has the structure in which an optical input from the position that overlaps with the optical propagation center of the device is performed, andsaid second optical branching device includes a 3 dB multimode interferometer ...

Pump-Combining Systems And Techniques For Multicore Fiber Transmissions

An optical fiber coupler connects transmission multicore optical fiber (TMCF) with an amplifier multicore optical fiber (AMCF) and a plurality of optical pump fibers. The coupler includes a plurality of signal cores extending between a multicore input endface and a coupler output endface, and a plurality of pump cores extending between a pump input and the coupler output endface. The multicore input endface is connectable to the TMCF, and the pump input is connectable to the optical pump fibers. Each pump core is paired with a corresponding signal core to form a core pair that is adiabatically tapered such that signal light carried by the signal core is combined with pump light carried by the pump core. The coupler output endface is connectable to the AMCF such that the combined light output of each core pair is provided as an input to a respective AMCF core. 1. An optical fiber coupler for connecting a transmission multicore optical fiber (TMCF) with an amplifier multicore optical fiber (AMCF) and a plurality of optical pump fibers , the coupler comprising:a plurality of signal cores extending between a multicore input endface and a coupler output endface, wherein the multicore input endface is configured to be connectable to the TMCF such that each signal core carries signal light at a signal wavelength from a respective TMCF core; anda plurality of pump cores, each extending between a pump input and the coupler output endface, wherein each pump input is configured to be connectable to a pump input fiber such that each pump core carries pump light at a pump wavelength from a respective pump input fiber, wherein the pump wavelength is different from the signal wavelength,wherein each pump core is paired with a corresponding signal core to form a core pair that is adiabatically tapered along an adiabatically tapered coupler section, such that signal light carried by the signal core is combined with pump light carried by the pump core along the adiabatically tapered ...

FIBER COUPLER

A fiber coupler is provided, which includes a tubular enveloping structure and several optical fibers arranged in the enveloping structure, each of which has a fiber core and a fiber cladding surrounding same, in order to conduct laser radiation, and each of which extends from the first as far as the second end of the enveloping structure. The enveloping structure includes a tapering section which is tapered in a first direction from the first as far as the second end. In the tapering section, both a first ratio of the diameter of the fiber core to the diameter of the fiber cladding and also a second ratio of the diameter of the mode field of the laser radiation conducted in the optical fiber to the diameter of the fiber core, increases in the first direction for each optical fiber. 1. A fiber coupler , comprising:a tubular enveloping structure; anda plurality of optical fibers arranged in the enveloping structure, each of which includesa fiber core and a fiber cladding surrounding same, in order to conduct laser radiation, and each of which extends from a first as far as a second end of the enveloping structure,wherein the enveloping structure has a tapering section which is tapered in a first direction from the first as far as the second end,wherein, in the tapering section, both a first ratio of the diameter of the fiber core to the diameter of the fiber cladding and a second ratio of the diameter of the mode field of the laser radiation conducted in the optical fiber to the diameter of the fiber core increase in the first direction for each optical fiber.2. The fiber coupler according to claim 1 , wherein the optical fibers are completely fused with one another at the second end claim 1 , at least one of directly and via the enveloping structure.3. The fiber coupler according to claim 2 , wherein the transition from the unfused region to the completely fused region lies at a point in the fiber coupler at which the optical fibers are tapered to at most 80% of ...

APPARATUS FOR COMBINING OPTICAL RADIATION

An apparatus for combining optical radiation, wherein the apparatus comprises a bundle of input optical fibres formed of glass, a taper, and an output optical fibre, wherein the taper is fused to the output optical fibre; and the apparatus comprises at least one cladding mode stripper to strip out higher order modes that would otherwise degrade a polymer coating on at least one of the input optical fibres and the output optical fibre. 1. An apparatus for combining optical radiation , comprising a bundle of input optical fibres formed of glass , a taper , and an output optical fibre , wherein:the taper is fused to the output optical fibre; andthe apparatus comprises at least one cladding mode stripper to strip out higher order modes that would otherwise degrade a polymer coating on at least one of the input optical fibres and the output optical fibre.2. An apparatus according to claim 1 , comprising a glass capillary that is fused to at least the outer fibres of the bundle of input optical fibres.3. An apparatus according to claim 2 , wherein the glass capillary has at least one angled end for reflecting higher order modes that may propagate along the capillary away from the glass capillary.4. An apparatus according to claim 1 , wherein:the taper has a first end having a first diameter, and a second end having a second diameter;the first diameter is greater than the second diameter;the plurality of input optical fibres are coupled to the first end;the second end is coupled to the output optical fibre;{'sub': 'F', 'the output optical fibre is defined by a fibre diameter D;'}the output optical fibre comprises a polymer coating;{'sub': 'F', 'the output optical fibre is defined by a numerical aperture NA;'}the apparatus being characterized in that:{'sub': CMS', 'F', 'F', 'T', 'CMS', 'F', 'F', 'T, 'the taper comprises the cladding mode stripper located at a diameter Dequal to a fraction, the numerator of which is the product of the fibre diameter D, the numerical aperture ...

MULTI-CLAD OPTICAL FIBER WITH TAPER PORTION, AND OPTICAL FIBER DEVICE HAVING SAME

There is described a multi-clad optical fiber for propagating an optical signal having at least a single mode. The multi-clad optical fiber generally has a fiber core, an inner cladding surrounding the fiber core, and at least an outer cladding surrounding the inner cladding, the multi-clad optical fiber having at least a taper portion extending along a longitudinal dimension z, the taper portion having a radial dimension progressively decreasing at a normalized slope exceeding an adiabaticity criterion of a conventional single-clad optical fiber propagating at least the single-mode across its single-mode core. 1. A multi-clad optical fiber for propagating an optical signal having at least a single mode , the multi-clad optical fiber comprising a fiber core , an inner cladding surrounding the fiber core , and at least an outer cladding surrounding the inner cladding , the multi-clad optical fiber having at least a taper portion extending along a longitudinal dimension z , the taper portion having a radial dimension progressively decreasing at a normalized slope exceeding an adiabaticity criterion of a conventional single-clad optical fiber propagating at least the single-mode across its single-mode core.2. The multi-clad optical fiber of wherein the normalized slope of the taper portion of the multi-clad optical fiber is below an adiabaticity criterion of the multi-clad optical fiber propagating at least the single-mode across the fiber core.4. The multi-clad optical fiber of wherein the optical signal has power within a spectral band at a given wavelength λ claim 1 , the fiber core being one of single-mode and few-mode at the given wavelength λ.5. The multi-clad optical fiber of wherein the fiber has a first refractive index n claim 1 , the inner cladding has a second refractive index nlower than the first refractive index n claim 1 , and the outer cladding has a third refractive index nlower than the second refractive index n.6. The multi-clad optical fiber of ...

FIBER ENDOSCOPE

A fibre endoscope system () comprises a catheter () with a probe head () for entering into a body cavity (C) adjacent or near a sample region (S). A source fiber () has a first fiber ending () and a signal fiber () has a second fiber ending () both remote from the probe head () but separate. A sampling fiber () has a third fiber ending () disposed at the probe head (). A fiber coupler () is configured to optically couple at least the source fiber () to the sampling fiber (), and the sampling fiber () to the signal fiber (). A sampling fiber length (L) of the sampling fiber () between a fiber coupler () and the third fiber ending () is shorter than a source fiber length (L) of the source fiber () between the fiber coupler () and the first fiber ending (). 1. A fibre endoscope system comprisinga catheter with a probe head for entering into a body cavity, duct, or vessel adjacent a sample region to be measured;a source fiber with a first fiber ending remote from the probe head;a signal fiber with a second fiber ending also remote from the probe head but separate from the source fiber;a sampling fiber with a third fiber ending disposed at the probe head; and the source fiber to the sampling fiber, and', 'the sampling fiber to the signal fiber;, 'a fiber coupler configured to optically couple at least'}wherein a sampling fiber length of the sampling fiber between the fiber coupler and the third fiber ending is shorter than a source fiber length of the source fiber between the fiber coupler and the first fiber ending by at least a factor two.2. The system according to claim 1 , wherein the sampling fiber is a multi-clad fiber comprising at least a fiber core with a first fiber cladding around the fiber core claim 1 , and a second fiber cladding surrounding the first fiber cladding; wherein the fiber coupler is configured to optically couple at leastthe source fiber to the fiber core of the sampling fiber, andthe first fiber cladding of the sampling fiber to the signal ...

Connector

A connector includes a first light transmission part and a second light transmission part, and when the connector is connected to an optical component, observing, by using the first light transmission part and the second light transmission part on an equipment room side, a detection light to identify the connector, and identifying an output port through which a user-side optical network unit (ONU) is connected to an equipment-room-side splitter.

SYSTEM AND METHOD FOR POSITIONING AN OPTICAL PREFORM IN A FURNACE

A system for positioning an optical preform in a furnace is provided that includes an upper muffle and a downfeed handle assembly with a tube defining a first end and a second end, the second end extending into the upper muffle. A handle is disposed within the tube. A second end of the handle extends into the upper muffle and a seal assembly is positioned around both the tube and the handle. The first end of the handle extends through the seal assembly and a drive assembly is coupled with the downfeed handle. 1. A system for positioning an optical preform in a furnace , comprising:an upper muffle; a tube defining a first end and a second end, the second end extending into the upper muffle;', 'a handle disposed within the tube, wherein a second end of the handle extends into the upper muffle; and', 'a seal assembly positioned around both the tube and the handle, the handle extending through the seal assembly; and, 'a downfeed handle assembly, comprisinga drive assembly coupled with the handle.2. The system of claim 1 , wherein the drive assembly is configured to move the handle at least one of laterally and rotationally within the tube.3. The system of claim 2 , wherein the handle is configured to move independently of the tube.4. The system of claim 3 , further comprising:a baffle coupled to the handle proximate the second end of the tube, the baffle configured to minimize fluid communication between the inner volume of the tube and the upper muffle.5. The system of claim 1 , wherein the handle extends out of the first and second ends of the tube.6. The system of claim 1 , wherein the tube defines a flange proximate the second end.7. The system of claim 1 , wherein the seal assembly further comprises a handle seal in physical contact with the handle.8. The system of claim 1 , wherein the seal assembly further comprises a tube seal in physical contact with the tube proximate the first end of the tube.9. A method for positioning an optical preform in a furnace claim 1 ...

DOUBLE ASYMMETRIC OPTICAL FIBER COUPLER

There is described an optical fiber coupler generally having: a first optical fiber having a longitudinally extending multimode guiding region and a first taper portion longitudinally extending between first and second locations of the first optical fiber, the first taper portion having a dimension progressively decreasing along a first taper direction from the first location to the second location; a second optical fiber having a longitudinally extending multimode guiding region and a second taper portion longitudinally extending between third and fourth locations of the second optical fiber, the second taper portion having a dimension progressively decreasing along a second taper direction from the third location to the fourth location; and a coupling region where at least a portion of the first taper portion is optically coupled to a portion of the second taper portion, with the first and second taper directions being opposite to one another. 1. An optical fiber coupler comprising:a first optical fiber having a longitudinally extending multimode guiding region and a first taper portion longitudinally extending between a first location and a second location of the first optical fiber, the first taper portion having a dimension progressively decreasing along a first taper direction from the first location to the second location;a second optical fiber having a longitudinally extending multimode guiding region and a second taper portion longitudinally extending between a third location and a fourth location of the second optical fiber, the second taper portion having a dimension progressively decreasing along a second taper direction from the third location to the fourth location; anda coupling region where at least a portion of the first taper portion is optically coupled to at least a portion of the second taper portion, with the first taper direction being opposite to the second taper direction.2. The optical fiber coupler of wherein the first optical fiber is a ...

COMBINER AND LASER DEVICE

A combiner includes: an input fiber bundle including input fibers; and a bridge fiber including a GI fiber section. A beam bundle emitted from the input fiber bundle enters the GI fiber section, the bridge fiber has a diameter smaller at an exit end surface of the bridge fiber than at an entrance end surface of the bridge fiber, and the GI fiber section converges the beam bundle. 112-. (canceled)13. A combiner comprising:an input fiber bundle comprising input fibers; anda bridge fiber comprising a GI fiber section, whereina beam bundle emitted from the input fiber bundle enters the GI fiber section,the bridge fiber has a diameter smaller at an exit end surface of the bridge fiber than at an entrance end surface of the bridge fiber, andthe GI fiber section converges the beam bundle.14. The combiner according to claim 13 , wherein the GI fiber section converges the beam bundle so that a plurality of beams that make up the beam bundle intersect with one another at a center of the exit end surface of the bridge fiber or at a predetermined distance from the center.15. The combiner according to claim 13 , further comprising:an output fiber into which the beam bundle enters, whereinthe GI fiber section converges the beam bundle so that a plurality of beams that make up the beam bundle intersect with one another at a center of an entrance end surface of the output fiber or at a predetermined distance from the center.16. The combiner according to claim 15 , wherein a core; and', 'a cladding that covers an outer circumferential surface of the core, and, 'the output fiber comprisesa portion of the core of the output fiber at the entrance end surface of the output fiber is fusion-spliced to a portion of a core of the bridge fiber at the exit end surface of the bridge fiber.17. The combiner according to claim 13 , whereinthe bridge fiber further comprises a SI fiber section,an entrance end surface of the SI fiber section is connected to an exit end surface of the GI fiber ...

Low bend loss single mode optical fiber

An optical fiber comprising: (i) a core region comprising an outer radius r 1 , and 3.0≤r 1 ≤7.0 microns and a relative refractive index Δ 1max and 0.32%≤Δ 1max ≤0.5%; (b) a depressed index cladding region surrounding the core region comprising an outer radius r 3 and a relative refractive index Δ 3 less than −0.2%, and trench volume V 3 wherein 45% Δ-micron 2 ≤|V 3 |≤200% Δ-micron 2 ; (c) a first outer cladding region surrounding the depressed index cladding region and comprising a relative refractive index Δ 4 and an outer radius r 4 ; and (d) a second outer cladding layer comprising 5 wt %-20 wt % titania, a relative refractive index Δ 5 , and a thickness T M , wherein 3 micron≤T M ≤30 microns, and outer radius r 5 ≤65 microns; the optical fiber has a mode field diameter MFD 1550 and 8 microns≤MFD 1550 ≤10.5 microns, a cutoff wavelength <1550 nm when bent 1 turn around a 2.5 mm radius mandrel, and a bending loss at 1550 nm when using a mandrel comprising a radius of 2.5 mm of ≤10 dB/turn.

Actuator systems for deflecting optical waveguides, and devices for processing optical signals comprising same

Actuator systems ( 10 ) are provided for inducing one or more static deflections, such as bends, in optical waveguides ( 12 ), to alter spectral characteristics of an optical signal transmitted through the waveguide. The actuator systems ( 10 ) can include actuators ( 28 ) that deflect the waveguide ( 12 ), and a controller ( 40 ) that controls the actuators ( 28 ) so that the deflections in the waveguide ( 12 ) are tailored to produce desired spectral characteristics in the optical signal. The actuator systems ( 10 ) can be used in conjunction with, for example, a fused fiber optic coupler ( 12 ) to form a wavelength selective switch. The actuator systems ( 10 ) can be used in conjunction with other types of waveguides to form other types of optical signal processors ( 14 ).

METHOD OF COUPLING OPTICAL FIBERS, AND OPTICAL COUPLER

There is described a method of optically coupling a first optical fiber and a second optical fiber to one another. The method generally has a step of bringing a free end of the first optical fiber, the second optical fiber and liquid in close proximity to one another within a coupling region, the free end of the first optical fiber having a dimension below a critical dimension, the free end of the first optical fiber moving within said liquid to contact the second optical fiber along a given coupling length, said contact optically coupling the free end of the first optical fiber and the second optical fiber to one another. 1. A method of optically coupling a first optical fiber and a second optical fiber to one another , the method comprising: bringing a free end of the first optical fiber , the second optical fiber and liquid in close proximity to one another within a coupling region , the free end of the first optical fiber having a dimension below a critical dimension , the free end of the first optical fiber moving within said liquid to contact the second optical fiber along a given coupling length , said moving including the free end at least partially wrapping around the second optical fiber along the given coupling length , said contact optically coupling the free end of the first optical fiber and the second optical fiber to one another.2. The method of wherein during said bringing the second optical fiber is free of tension.3. The method of wherein said bringing includes bringing the free end and the second optical fiber in close proximity to one another within the coupling region and then injecting the liquid within said coupling region.4. The method of further comprising allowing said liquid to evaporate adhering the free end of the first optical fiber and the second optical fiber to one another.5. The method of further comprising claim 1 , prior to said bringing claim 1 , tapering the first optical fiber leaving a waist portion extending between down- ...

MONOLITHIC MULTI-OPTICAL-WAVEGUIDE PENETRATOR OR CONNECTOR

Methods and apparatus are provided for a monolithic multi-optical-waveguide penetrator or connector. One example apparatus generally includes a plurality of large diameter optical waveguides, each having a core and a cladding, and a body having a plurality of bores with the optical waveguides disposed therein, wherein at least a portion of the cladding of each of the optical waveguides is fused with the body, such that the apparatus is a monolithic structure. Such an apparatus provides for a cost- and space-efficient technique for feedthrough of multiple optical waveguides. Also, the body may have a large outer diameter which can be shaped into features of interest, such as connection alignment or feedthrough sealing features. 1. A method for forming an apparatus for transmitting light along multiple pathways , comprising:positioning a plurality of large diameter optical waveguides, each having a core and a cladding, in a plurality of bores of a body; andfusing at least a portion of the cladding of each of the optical waveguides with the body, such that the apparatus resulting therefrom is a monolithic structure.2. The method of claim 1 , further comprising drilling the plurality of bores in the body before the positioning.3. The method of claim 1 , further comprising drawing the body having the plurality of bores from a preform before the positioning.4. The method of claim 1 , further comprising forming at least one orientation feature in the body.5. The method of claim 4 , wherein the at least one orientation feature comprises at least one flat surface formed in an outer diameter of the body and parallel to an axis of the body.6. The method of claim 1 , further comprising dicing the apparatus in the fused portion to form two apparatuses.7. The method of claim 6 , further comprising polishing an end face of at least one of the two apparatuses.8. The method of claim 6 , further comprising butting end faces of the two apparatuses together claim 6 , such that the ...

MONOLITHIC MULTI-OPTICAL-WAVEGUIDE PENETRATOR OR CONNECTOR

Methods and apparatus are provided for a monolithic multi-optical-waveguide penetrator or connector. One example apparatus generally includes a plurality of large diameter optical waveguides, each having a core and a cladding, and a body having a plurality of bores with the optical waveguides disposed therein, wherein at least a portion of the cladding of each of the optical waveguides is fused with the body, such that the apparatus is a monolithic structure. Such an apparatus provides for a cost- and space-efficient technique for feedthrough of multiple optical waveguides. Also, the body may have a large outer diameter which can be shaped into features of interest, such as connection alignment or feedthrough sealing features. 1. An apparatus for transmitting light along multiple pathways , comprising:a plurality of large diameter optical waveguides, each having a core and a cladding, wherein the apparatus is a monolithic structure; anda body having a plurality of bores with the optical waveguides disposed therein, wherein at least part of the cladding of each of the optical waveguides is fused with the body to form the monolithic structure and wherein the body comprises at least one orientation feature.2. The apparatus of claim 1 , wherein the at least one orientation feature comprises at least one flat surface formed in an outer diameter of the body and parallel to an axis of the body.3. The apparatus of claim 1 , wherein the body has at least two different outer diameters.4. The apparatus of claim 3 , wherein the body comprises a sealing surface between the at least two different outer diameters.5. The apparatus of claim 4 , wherein the sealing surface comprises a convex frustoconical section between the at least two different outer diameters.6. The apparatus of claim 1 , wherein a temperature coefficient of the cladding of each of the optical waveguides is about the same as a temperature coefficient of the body.7. The apparatus of claim 1 , wherein the body and ...

FUSED FIBRE COUPLERS, AND APPARATUSES AND METHODS FOR THE MANUFACTURE AND USE THEREOF

A fused fibre coupler comprising: a single mode fibre, SMF, and an orbital angular momentum fibre, OAMF, the fibres having a coupling portion in which the fibres are longitudinally aligned side by side and fused at least over a coupling length in which the SMF and OAMF are tapered such that the diameter of the SMF and the diameter of the OAMF give the fibres matching effective refractive indices for a single mode of the SMF and an orbital angular momentum, OAM, mode of the OAMF for a coupled wavelength of light. 1. A fused fibre coupler comprising:a single mode fibre, SMF, and an orbital angular momentum fibre, OAMF, the fibres having a coupling portion in which the fibres are longitudinally aligned side by side and fused at least over a coupling length in which the SMF and OAMF are tapered such that the diameter of the SMF and the diameter of the OAMF give the fibres matching effective refractive indices for a single mode of the SMF and an orbital angular momentum, OAM, mode of the OAMF for a coupled wavelength of light.2. The fused fibre coupler as claimed in claim 1 , wherein the OAMF is an air core fibre.3. The fused fibre coupler as claimed in claim 1 , wherein the OAMF is a solid core fibre.4. The fused fibre coupler as claimed in claim 1 , or claim 1 , wherein the effective refractive indices of the modes propagating in the OAMF and SMF are matched for a given wavelength of light from a light source to be coupled into or out of the OAMF.5. The fused fibre coupler of any preceding claim claim 1 , wherein the fibres are weakly fused over the coupling length.6. The fused fibre coupler of any preceding claim claim 1 , wherein the coupling length is a length over which light of the coupled wavelength couples into two orthogonally polarised hybrid modes of the OAMF π/2 out of phase claim 1 , so as to couple the light into an orbital angular momentum claim 1 , OAM claim 1 , mode of the OAMF.7. The fused fibre coupler of any preceding claim claim 1 , wherein the SMF ...

OPTICAL COMBINER, LASER DEVICE USING SAME, AND METHOD FOR MANUFACTURING OPTICAL COMBINER

An optical combiner includes a plurality of incoming optical fibers an outgoing optical fiber and a plurality of bridge fibers provided between the plurality of incoming optical fibers and the outgoing optical fiber the plurality of bridge fibers being optically coupled to each other. In the bridge fibers a ratio of the outer diameter of a core to the outer diameter of a cladding is smaller in a bridge fiber located more apart from the incoming optical fiber 110-. (canceled)11. An optical combiner comprising:a plurality of incoming optical fibers;an outgoing optical fiber; anda plurality of bridge fibers provided between the plurality of incoming optical fibers and the outgoing optical fiber, the plurality of bridge fibers being optically coupled to each other, whereineach of the plurality of bridge fibers has a core, a cladding that surrounds an outer circumferential surface of the core, and a tapered portion where an outer diameter is more decreased toward an emission end,in the plurality of bridge fibers, a ratio of an outer diameter of the core to an outer diameter of the cladding is smaller in a bridge fiber located more apart from the incoming optical fibers, andin the plurality of bridge fibers, a bridge fiber to which the outgoing optical fiber is coupled is fusion-spliced to the outgoing optical fiber.12. An optical combiner comprising:a plurality of incoming optical fibers;an outgoing optical fiber; anda plurality of bridge fibers provided between the plurality of incoming optical fibers and the outgoing optical fiber, the plurality of bridge fibers being optically coupled to each other, whereineach of the plurality of bridge fibers has a tapered portion where an outer diameter is more decreased toward an emission end,in the plurality of bridge fibers, a bridge fiber to which the plurality of incoming optical fibers is coupled entirely propagates a light beam, and two or more bridge fibers other than the bridge fiber have a core and a cladding that ...

All fiber Laser Interference Lithography Setup and Methods

A laser interference lithography device using all-fiber-optic components is disclosed. In the said all-fiber laser interference lithography device, an input coupling fiber receives the coherent laser beam from a laser source and sends it to an optical fiber splitter. The optical fiber splitter splits the input laser beam into at least two sub-beams and outputs the multiple sub-beams through multiple output optical fiber. Adjustable fiber holders, each carrying one output fiber, tune the position and angle of output optical fibers to achieve desired interference patterns on a substrate 110-. (canceled)11. A two-beam laser interference pattern generation device for creating periodic nano structures , comprising:an ultraviolet laser source with a single-mode polarization-maintaining output fiber;a 1×2 polarization maintaining fiber slitter, which has one input fiber port connected to the output fiber of the laser source, and two polarization-maintaining output fibers, emitting approximately equal-intensity laser beams into free space towards a substrate stage;the substrate stage, which carries a substrate coated with a layer of photosensitive material to record an interference pattern from two interfering beams, and is driven by a close-loop feedback stabilization mechanism, configured to track the interference patterns and eliminate drifting in interference patterns on the substrate by moving the substrate stage;motorized output fiber holders, each carrying one output fiber port of the polarization maintaining fiber splitter; anda control mechanism, comprising a processing hardware unit and a software interface, to operate the device.12. The device according to claim 11 , wherein the polarization maintaining fiber slitter is a fused fiber splitter.13. The device according to claim 11 , wherein the substrate stage comprises a piezoelectric actuator as an actuating element of the close-loop feedback stabilization mechanism.14. The device according to claim 11 , wherein ...

INFRARED FIBER COMBINER

A light system may include a fused mid-IR tapered combiner to optically connect a bundle of mid-IR fiber bundles with a multimode fiber. The fused mid-IR fiber tapered combiner arranges a bundle of fibers in a geometric arrangement to reduce the diameter of a plurality of mid-IR fibers to match or equal the diameter of a single multimode mid-IR fiber. The mid-IR fibers carry light produced and emitted from semiconductor light sources. 1. A mid-infrared (IR) fiber combiner comprising:an upstream end opposite a downstream end, wherein energized light travels from the upstream end towards the downstream end;an entrance region;a plurality of mid-IR fibers for transmitting light having wavelengths ranging from about 285 nm to about 5.5 μm, wherein each mid-IR fiber is independent from other mid-IR fibers upstream from the entrance region;a first tapering region positioned downstream from the entrance region, wherein the plurality of mid-IR fibers taper inwardly towards a longitudinal axis, wherein each mid-IR fibers is independent from other mid-IR fibers in the first tapering region;a combining region positioned downstream from the first tapering region;a fiber bundle in the combining region having a first diameter formed from the plurality of mid-IR fibers compressed together, wherein each mid-IR fiber in the fiber bundle is independent from other mid-IR fibers in the combining region;a second tapering region positioned downstream from the combining region, wherein the fiber bundle extends downstream and tapers inwardly towards the longitudinal axis in the second tapering region, wherein each mid-IR fiber in the fiber bundle is independent from other mid-IR fibers in the tapered region; anda narrowed exit region positioned downstream from the second tapering region, wherein the fiber bundle has a second diameter in the narrowed exit region defining a narrowed bundle portion, and wherein the second diameter is narrower than the first diameter, wherein each mid-IR fiber ...

FIBER OPTIC CABLE CONNECTOR ASSEMBLY INCLUDING INTEGRATED ENHANCED FUNCTIONALITY

A fiber optic cable and connector assembly is disclosed. The assembly includes a cable optical fiber, a ferrule, a stub optical fiber having a first portion supported within the ferrule a second portion the projects rearwardly the ferrule and a signal modification structure optically coupled between the stub optical fiber and the cable optical fiber. 1. A fiber optic cable and connector assembly comprising:a cable optical fiber;a ferrule having a front end and a rear end, the ferrule also defining a longitudinal bore;a stub optical fiber having a first portion supported within the longitudinal bore and a second portion that projects rearwardly from the rear end of the ferrule;a signal modification fiber optically coupled between the stub optical fiber and the cable optical fiber, the signal modification fiber being configured to support multiple transmission modes over a predetermined signal wavelength range;the cable optical fiber and the stub optical fiber being configured to support a single transmission mode over the predetermined signal wavelength range; anda hub supporting the rear end of the ferrule and covering the second portion of the stub optical fiber and at least a portion of the signal modification fiber.2. The fiber optic cable and connector assembly of claim 1 , wherein the signal modification fiber functions as a bandpass filter.3. The fiber optic cable and connector assembly of wherein the signal modification fiber functions as an edge filter.4. The fiber optic cable and connector assembly of claim 1 , wherein the signal modification fiber is a stepped index fiber having a having a stepped refractive index profile defined radially between a core and a cladding of the signal modification fiber.5. The fiber optic cable and connector assembly of wherein the cable optical fiber and the stub optical fiber have a core diameter in the range of 8-12 microns claim 1 , and wherein the signal modification fiber has a core diameter of at least 20 microns.6. ...

SYSTEM AND METHOD FOR POSITIONING AN OPTICAL PREFORM IN A FURNACE

A system for positioning an optical preform in a furnace is provided that includes an upper muffle and a downfeed handle assembly with a tube defining a first end and a second end, the second end extending into the upper muffle. A handle is disposed within the tube. A second end of the handle extends into the upper muffle and a seal assembly is positioned around both the tube and the handle. The first end of the handle extends through the seal assembly and a drive assembly is coupled with the downfeed handle. 1. A method for positioning an optical preform in a furnace , comprising:providing a chuck interface movably coupled with a drive assembly;positioning the chuck interface within a seal assembly;coupling a handle within the chuck interface, an optical fiber preform positioned on an opposite end of the handle from the chuck interface;positioning the handle within a tube;positioning the optical fiber preform within a furnace; andmoving the handle at least one of laterally and rotationally within the tube such that the optical fiber preform is moved at least one of laterally and rotationally within the furnace.2. The method of claim 1 , wherein the handle extends through the seal assembly.3. The method of claim 2 , wherein the handle moves laterally within the tube and the lateral movement of the handle is independent of the tube.4. The method of claim 3 , wherein the handle moves rotationally within the tube and the rotational movement of the handle is independent of the tube.5. The method of claim 1 , wherein the handle and the tube are configured to move vertically together.6. The method of claim 1 , wherein the chuck interface is coupled to a face seal within the seal assembly.7. A system for positioning an optical preform in a furnace claim 1 , comprising: a tube defining a first end and a second end;', 'a handle disposed within and extending through the tube; and', 'a seal assembly extending around both the handle and the tube, the handle extending through ...

COATING REMOVAL TOOL

A coating removal tool includes a base part and a cover part, to remove a coating of an optical fiber by overlapping the cover part and the base part. The base part and the cover part are made of resin, and include at least a pair of coating removal blades including a base front blade portion provided on the base part and a cover front blade portion provided on the cover part. The base part includes a V-groove which sandwiches the optical fiber in either one or both of a front and rear of the optical fiber in the longitudinal direction and the cover part includes a V-groove which sandwiches the optical fiber and is provided on a side where the V-groove exists in the front and rear of the longitudinal direction in a state where the cover part and the base part are overlapped. 1. A coating removal tool comprising a base part and a cover part , to remove a coating of an optical fiber by overlapping the cover part and the base part with each other via the optical fiber , in which a glass fiber is covered with the coating ,wherein the base part and the cover part are made of resin, and include at least a pair of coating removal blades including a base blade portion provided on the base part and a cover blade portion provided on the cover part,wherein the base part includes a first V-groove which sandwiches the optical fiber in either one or both of a front and rear of the optical fiber in the longitudinal direction with respect to the base blade portion, andwherein the cover part includes a second V-groove which sandwiches the optical fiber, and the second V-groove is provided on a side where the first V-groove exists in the front and rear of the longitudinal direction with respect to the cover blade portion in a state where the cover part and the base part are overlapped with each other.2. The coating removal tool according to claim 1 , comprising a hinge part that pivotably connects the cover part to the base part claim 1 ,wherein the cover part, the base part and the ...

METHODS FOR FORMING SIDE-PUMPED OPTICAL FIBER COMBINERS

A method for forming a side-pumped optical fiber combiner includes ablating a cladding of a signal fiber to form an angled notch in the cladding. The signal fiber includes a core and the cladding surrounding the core. The method further includes inserting a cladding-free end of a pump fiber into the angled notch. The pump fiber includes a core and a cladding, the cladding-free end including the core of the pump fiber and free from the cladding of the pump fiber. The method further includes fusing the cladding-free end to the signal fiber. 1. A method for forming a side-pumped optical fiber combiner , the method comprising:ablating a cladding of a signal fiber to form an angled notch in the cladding, the signal fiber comprising a core and the cladding surrounding the core;inserting a cladding-free end of a pump fiber into the angled notch, the pump fiber comprising a core and a cladding, the cladding-free end comprising the core of the pump fiber and free from the cladding of the pump fiber; andfusing the cladding-free end to the signal fiber.2. The method of claim 1 , wherein the angled notch extends only into the cladding of the signal fiber and does not extend into the core of the signal fiber.3. The method of claim 1 , wherein the angled notch is longitudinally aligned with a longitudinal axis of the signal fiber.4. The method of claim 1 , wherein the angled notch extends into the cladding at an angle of between 15 degrees and 55 degrees from a longitudinal axis of the signal fiber.5. The method of claim 1 , wherein a maximum width of the angled notch is greater than a maximum outer diameter of the core of the pump fiber.6. The method of claim 5 , wherein the maximum width of the angled notch is within 10 microns of the maximum outer diameter of the core of the pump fiber.7. The method of claim 1 , wherein a maximum length of the angled notch is between 5 millimeters and 50 millimeters.8. The method of claim 1 , further comprising performing cladding removal of ...

OPTICAL EQUALIZER FOR PHOTONICS SYSTEM

The present disclosure provides an optical equalizer for photonics system in an electric-optical communication network. The optical equalizer includes an input port and an output port. Additionally, the optical equalizer includes a filter having a number of stages coupled to each other in a multi-stage series with an output terminal of any stage being coupled to an input terminal of an adjacent next stage while the input terminal of a first stage of the multi-stage series being coupled from the input port. Each stage includes a tap terminal configured to pass an optical power factored by a coefficient of multiplication from the corresponding input terminal of the stage to a tap-output path characterized by a corresponding phase delay. Furthermore, the optical equalizer includes a combiner configured to sum up the optical powers respectively from the number of tap-output paths of the multi-stage series to the output port. 1. An optical equalizer comprising:an input port configured to receive an optical signal;an output port;a filter comprising multiple stages coupled in series, a respective one of the multiple stages including a tap terminal configured to pass a respective one fraction of the optical signal factored by a coefficient of multiplication to a respective one tap-output path of the respective one stage characterized by a corresponding phase delay;a combiner configured to sum up all fractions of the optical signal respectively from all tap-output paths to the output port; anda thermal heater disposed to the respective one tap-output path for tuning the corresponding phase delay of the respective one fraction of the optical signal thereof,wherein the filter comprises a directional tap coupler per stage, wherein at least a first stage of the filter is an asymmetric directional tap coupler.2. The optical equalizer of claim 1 , wherein the coefficient of multiplication associated with the directional tap coupler at the respective one stage comprises a non- ...

FIBER OPTIC CABLE CONNECTOR ASSEMBLY INCLUDING INTEGRATED ENHANCED FUNCTIONALITY

A fiber optic cable and connector assembly is disclosed. The assembly includes a cable optical fiber, a ferrule, a stub optical fiber having a first portion supported within the ferrule a second portion the projects rearwardly the ferrule and a signal modification structure optically coupled between the stub optical fiber and the cable optical fiber. 1. A fiber optic cable and connector assembly comprising:a cable optical fiber;a ferrule having a front end and a rear end, the ferrule also defining a longitudinal bore;a stub optical fiber having a first portion supported within the longitudinal bore and a second portion that projects rearwardly from the rear end of the ferrule;a signal modification fiber optically coupled between the stub optical fiber and the cable optical fiber, the signal modification fiber being fusion spliced directly to the cable optical fiber at a first splice location at a first end of the signal modification fiber, and the signal modification fiber being fusion spliced directly to the stub optical fiber at a second splice location at a second end of the signal modification fiber, the signal modification fiber being configured to support multiple transmission modes over a predetermined signal wavelength range, the signal modification fiber, the stub optical fiber, and the cable optical fiber each having a constant mode field diameter along its length;the cable optical fiber and the stub optical fiber being configured to support a single transmission mode over the predetermined signal wavelength range.2. The fiber optic cable and connector assembly of claim 1 , wherein the signal modification fiber functions as a bandpass filter.3. The fiber optic cable and connector assembly of claim 1 , wherein the signal modification fiber functions as an edge filter.4. The fiber optic cable and connector assembly of claim 1 , wherein the signal modification fiber is a stepped index fiber having a having a stepped refractive index profile defined radially ...

FIBRE COUPLER FOR CREATION OF HIGH TEMPERATURE-RESISTANT INTERFEROMETERS AND HIGH TEMPERATURE-RESISTANT INTERFEROMETER

Fibre coupler for creation of optical fibre-containing interferometers (sensors), with at least two parallel optical fibres placed in an enclosure characterized in that each of the optical fibres consists of at least three alternately placed light-conductive sections with different coatings, at least one () of which has a melting point above 200° C., and the two corresponding sections () with coating other than with a melting point above 200° C. are coupled using any known method. Interferometer containing above described fibre couplers, where the fibre couplers are interconnected by at least two optical fibre sections () with a high temperature-resistant coating. 112. Fibre coupler for creation of optical fibre-containing interferometers (sensors) , with at least two parallel optical fibres placed in an enclosure characterized in that each of the optical fibres consists of at least three alternately placed light-conductive sections with different coatings , at least one () of which has a melting point above 200° C. , and the two corresponding sections () with coating other than with a melting point above 200° C. are coupled using any known method.221. Device according to characterized in that each of the optical fibre contains sections () with a non-metallic coating in between sections () with coatings with a melting point above 200° C.3. Device according to characterized in that the coating with a melting point above 200° C. is metallic.4. Device according to characterized in that the optical fibre with coatings other than with a melting point above 200° C. are polymer-covered optical fibres.5. Device according to characterized in that individual optical fibre sections are interconnected frontally by splicing.62. Device according to characterized in that the mutually corresponding optical fibre sections () with a non-metallic coating are interconnected in a way claim 1 , that their cores are close enough so as to enable optical signal propagation between optical ...

OPTICAL FIBER AND FIBER LASER

The present invention comprises a core () and a primary coating () that is lower in refractive index than the core () and that covers the side surface of the core () except in a coating-removed section (I). The side surface of the core (), in at least part of the coating-removed section (I), is covered with an intermediate-refractive-index resin part () that is lower in refractive index than the core () and that is higher in refractive index than the primary coating (). 1. An optical fiber comprising:an optical waveguide; anda coating that is lower in refractive index than the optical waveguide and that covers a side surface of the optical waveguide except in a coating-removed section,in at least part of the coating-removed section, the side surface of the optical waveguide being covered with a medium that is lower in refractive index than the optical waveguide and that is higher in refractive index than the coating.2. The optical fiber according to claim 1 , wherein the side surface of the optical waveguide claim 1 , in every transverse cross section in the coating-removed section claim 1 , is covered with the medium from all directions in the every transverse cross section.3. The optical fiber according to claim 1 , wherein the side surface of the optical waveguide claim 1 , only in some transverse cross sections in the coating-removed section claim 1 , is covered with the medium from at least some directions in each of the some transverse cross sections.4. The optical fiber according to claim 1 , wherein the side surface of the optical waveguide claim 1 , in at least some transverse cross sections in the coating-removed section claim 1 , is covered with the medium only from some directions in each of the some transverse cross sections.5. The optical fiber according to claim 1 , wherein:the coating-removed section borders on two sections, one of which is a first coated section in which the side surface of the optical waveguide is covered with the coating; andthe ...

Opical Amplifier and Method

An electro-optic beam controller, material processing apparatus, or optical amplifier, and corresponding methods, can include an actively controlled, waveguide-based, optical spatial mode conversion device. The conversion device can include a coupler, which can be a photonic lantern, configured to combine light beams into a common light beam; a sensor configured to measure at least one characteristic of the common light beam; and a controller configured to modulate optical parameters of the individual, respective light beams to set one or more spatial modes of the common light beam. Actively controlled and modulated devices can be used to maintain a stable, diffraction-limited beam for use in an amplification, communications, imaging, laser radar, switching, or laser material processing system. Embodiments can also be used to maintain a fundamental or other spatial mode in an optical fiber even while scaling to kilowatt power. 145-. (canceled)46. An optical amplifier comprising:an actively controlled, waveguide-based optical spatial mode conversion device configured to provide a common light beam; anda waveguide-based amplifier configured to receive and amplify at least a portion of the common light beam to produce an amplified common light beam.47. The optical amplifier of claim 46 , wherein the amplified common light beam has an optical power on the order of 10 W claim 46 , 3 kW claim 46 , or 12 kW.48. The optical amplifier of claim 46 , further comprising:a waveguide coupler configured to combine individual light beams carried by respective, individual, optical waveguides into the common light beam to be carried by a common, multimode optical waveguide;a sensor configured to measure at least one characteristic of the amplified common light beam; anda modulation controller operationally coupled to the sensor and to a plurality of modulators, each modulator of the plurality of modulators configured to modulate at least one optical parameter of the respective, ...

BEND-INSENSITIVE SINGLE-MODE OPTICAL FIBER FOR FUSED BICONICAL TAPER FIBER OPTIC COUPLER

Embodiments are directed to a single mode optical fiber. The optical fiber comprises, from the center to the periphery: a central core having a first refractive index, a pedestal region having a second refractive index, a trench region having a third refractive index, and a cladding region having a fourth refractive index. The third refractive index is less than the second refractive index. 1. A single mode optical fiber , comprising from the center to the periphery:a central core having a first refractive index;a pedestal region having a second refractive index;a trench region having a third refractive index; and 'the third refractive index is less than the second refractive index.', 'a cladding region having a fourth refractive index; wherein2. The single mode optical fiber of claim 1 , wherein the first refractive index is greater than the second refractive index.3. The single mode optical fiber of claim 2 , wherein the second refractive index is chosen to minimize bending loss.4. The single mode optical fiber of claim 1 , wherein the fourth refractive index is greater than the third refractive index.5. The single mode optical fiber of claim 4 , wherein the third refractive index is chosen to minimize bending loss.6. The single mode optical fiber of claim 1 , wherein the fourth refractive index is less than the second refractive index.7. The single mode optical fiber of claim 1 , wherein the central core comprises a silica doped with germanium.8. The single mode optical fiber of claim 1 , wherein the trench region comprises a silica with no dopant.9. The single mode optical fiber of claim 8 , wherein the pedestal region comprises a silica doped with germanium such that the second refractive index is higher than the third refractive index and lower than the first refractive index.10. The single mode optical fiber of claim 8 , wherein the cladding region comprises a silica doped with germanium such that the fourth refractive index is higher than the third ...

OPTICAL SIGNAL SPLITTER

The disclosure relates to an optical splitter including two waveguides on either side of an axis. Each waveguide includes a first segment and a second segment that are closer to the axis than the rest of the waveguide. The first segments are optically coupled and the second segments are optically coupled. Each guide includes between the first and second segment, starting from the first segment, a first curved section including in succession a curvature the concavity of which is turned the side opposite the axis then a curvature the concavity of which is turned towards the axis, and starting from the second segment a second curved section including in succession a curvature the concavity of which is turned the side opposite the axis then a curvature the concavity of which is turned towards the axis. The first curved sections of the two waveguides are curved differently. 1. An optical signal splitter comprising two waveguides on either side of an axis , wherein:each waveguide includes a first segment and a second segment that are closer to the axis than the rest of the waveguide, the first segments of the two waveguides being optically coupled and the second segments of the two waveguides being optically coupled; andeach waveguide includes between the first and second segment, starting from the first segment, a first curved section including in succession a curvature the concavity of which is turned the side opposite the axis then a curvature the concavity of which is turned towards the axis, and starting from the second segment a second curved section including in succession a curvature the concavity of which is turned the side opposite the axis then a curvature the concavity of which is turned towards the axis and wherein the first curved sections of the two waveguides are curved differently.2. The optical splitter according to wherein claim 1 , starting from the first segments of the two waveguides claim 1 , the first curved sections of the two waveguides get ...

ASYMMETRIC OPTICAL FIBER COUPLER

There is described an optical fiber coupler in which at least one fiber is a multiple-clad fiber, containing a single-mode core supporting a single guiding mode and an inner multi-mode cladding guiding multiple modes. The multiple-clad fiber is fused with a second fiber of a different etendue to create an optical fiber coupler having an enhanced multi-mode signal transmission. 1. An optical fiber coupler comprising:a first optical fiber having a first cross-talk portion located between a first end and a second end, and having a first single-mode core, at least one inner multi-mode cladding, and a first outer cladding, the first cross-talk portion having a first etendue;a second optical fiber having a second cross-talk portion located between a third end and a fourth end, the second cross-talk portion having a second etendue, the second etendue forming an etendue ratio differing from one relative to the first etendue; anda coupling region where the first cross-talk portion is optically coupled to the second cross-talk portion;wherein the etendue ratio is indicative of a transmission of a multi-mode signal between the second end of the first optical fiber and the third end of the second optical fiber.2. The optical fiber coupler of claim 1 , wherein the transmission of the multi-mode signal is above 50%.3. The optical fiber coupler of claim 2 , wherein the transmission of the multi-mode signal is preferably above 60%.4. The optical fiber coupler of claim 3 , wherein the transmission of the multi-mode signal is most preferably above 70%.5. The optical fiber coupler of claim 1 , wherein the etendue ratio is above 1.5.6. The optical fiber coupler of claim 5 , wherein the etendue ratio is preferably above 2.7. The optical fiber coupler of claim 6 , wherein the etendue ratio is most preferably above 10.8. The optical fiber coupler of claim 1 , wherein the cross-talk portions are optically coupled to one another along only a portion of their lengths.9. The optical fiber ...

Optical Spectrum Shaper and Optical Signal Monitor Using Same

The present invention implements an optical spectral shaper that is compact even if a number of input/output ports increases. The present invention provides a spatial light modulator, including: an optical waveguide front end that includes an input side waveguide portion which emits each signal light at a different angle while expanding a beam diameter of the signal light, and an output side waveguide portion that wave-guides each of the inputted signal lights, and couples the signal lights with a plurality of output fibers respectively; a spatial light modulator that changes the phase of each signal light by controlling the phase pattern of the plurality of pixels and emits the signal light, and the spatial light modulator in which a specific phase pattern is set for each pixel region to which each signal light enters; and an optical element group that is disposed so that each of the signal lights emitted from the optical waveguide front end is collected at a different pixel position on the spatial light modulator, and the light emitted from the spatial light modulator is coupled with the optical waveguide front end. 1. An optical spectral shaper , comprising:a plurality of input fibers that input signal lights;a plurality of output fibers that output the signal lights;an optical waveguide front end that includes an input side waveguide portion which emits each signal light at a different angle while expanding a beam diameter of the signal light emitted from each of the plurality of input fibers respectively, and an output side waveguide portion that wave-guides each of the inputted signal lights and couples the signal lights with the plurality of output fibers respectively;a spatial light modulator that includes a plurality of pixels which are arrayed on a plane in a matrix and a drive unit that drives the plurality of pixels, and that changes the phase of each inputted signal light by the drive unit controlling the phase patterns of the plurality of pixels, and ...

Optical coupler

An improved optical coupler having improved performance at room temperature and a greater thermal operating range. The coupler comprises two optically contacted optical fibers in a substrate wherein the externally induced stress on the fibers in the region of optical contact, is reduced. The reduction occurs as a result of shape and material selection of the substrate. A process for making the coupler is also disclosed.

Fibre optic coupler

A fibre-optic coupler has the claddings of two or more optical fibres partially fused together over a coupling region, and a body of light-transmissive material, having a variable refractive index, contacts the claddings at the coupling region, such that by varying the refractive index of said body light transmitted along one fibre is split between the fibres in a varying ratio.

Reinforced multicore optical fiber coupler

본 발명은, 복수의 광파이버를 융착ㆍ연신해서 형성되는 다심형의 광파이버커플러의 보강구조에관한 것으로서, 온도변화 및 고습도하에 있어서도 전달특성이 좋은 광파이버커플러를 제공하는 것을 목적으로 한 것이며, 그 구성에 있어서, 보강케이스(21A)∼(21C)에 형성한 홈(22)에 연신한 광파이버소선을 삽입하고, 소량의 자외선경화형접착제(35)로 고정한 것을 특징으로 한 것이다. The present invention relates to a reinforcing structure of a multicore optical fiber coupler formed by fusing and stretching a plurality of optical fibers, and an object thereof is to provide an optical fiber coupler having good transmission characteristics even under temperature changes and high humidity. In this case, the optical fiber strands drawn in the grooves 22 formed in the reinforcing cases 21A to 21C are inserted and fixed with a small amount of the UV-curable adhesive 35.

多重化および分波単モード光ファイバ・カップラの製作

(57)【要約】 多重化および分波単モード・ファイバ光カップラを、保護プラスチック・ジャケットが剥離されて清浄にされた２本の単一モード・ファイバを互いに接触した状態で保持されるように整列させ、次いでこれらのファイバを融着して望みの融着プロファイルを達成し、融着ファイバを伸張して波長周期と偏光位相との間の整合点を達成することによって製作する。伸長工程を必要に応じて中断および再開し、望みの多重化および分波カップラの製造に必要な正確な整合点を得る。

加固型多芯光纤耦合器

本发明为多芯光纤耦合器的加固型外壳，其中的多芯光纤具有许多根互相平行地设置并且一起被线种公共的覆层树脂所包覆的光纤丝。把多芯光纤的轴向覆层树脂部分去除，以露出光纤丝的玻璃部分。接着对露出的玻璃部分进行融化和拉伸。每根光纤丝在轴线方向上的玻璃部分的融化及拉伸部分两侧的未拉伸部分分别被置入加固型外壳上形成的多个槽中。上述的加固型外壳由线膨胀系数大致与石英相同的材料制成。

光スタ−カプラの製造方法

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Production of coupler

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Optical fiber comprising first cladding and second cladding having different refractive indices

直径がD c であり、屈折率がn c であるコアと、このコアを同心状に取り囲み、外径がd pc であり、このコアの屈折率n c よりも小さな屈折率n pc を有する第１クラッドと、この第１クラッドを同心状に取り囲み、外径がd sc であり、第１クラッドの屈折率n pc よりも小さな屈折率n sc を有する第２クラッドと、を有する光ファイバーである。 【選択図】図４

Optical fiber combiner and laser device using the same

【課題】 光の損失を抑制することができる光ファイバコンバイナ、及び、それを用いたレーザ装置を提供する。 【解決手段】 光ファイバコンバイナ１は、複数の入力用光ファイバ２０と、それぞれの入力用光ファイバ２０から出射する光が入射し、入力用光ファイバ２０からの光を発散角が小さくされた状態で出射する複数の発散角低減部材５０と、それぞれの発散角低減部材５０から出射する光が入射し、光が伝播する部位が発散角低減部材５０側から離れるに従い徐々に縮径されるテーパ部３４を有するブリッジファイバ３０と、ブリッジファイバ３０の発散角低減部材５０側と反対側から出射する光が入射する出力用光ファイバ４０と、を備える。 【選択図】 図１ PROBLEM TO BE SOLVED: To provide an optical fiber combiner capable of suppressing light loss and a laser device using the same. In an optical fiber combiner, a plurality of input optical fibers 20 and light emitted from each of the input optical fibers 20 are incident, and the divergence angle of the light from the input optical fiber 20 is reduced. A plurality of divergence angle reducing members 50 that are emitted from the divergence angle, and a tapered portion that is gradually reduced in diameter as the light emitted from each of the divergence angle reduction members 50 enters and the portion where the light propagates is separated from the divergence angle reduction member 50 side. And the output optical fiber 40 into which the light radiate | emitted from the opposite side to the divergence angle reduction member 50 side of the bridge fiber 30 injects. [Selection] Figure 1

Optical coupler and process for preparation thereof

An optical coupler comprising N number (where N stands for an integer of not less than 2) of optical fibers having one ends integrated and the other ends branched and N number of optical coupler parts, wherein the top end of each light branching-coupling optical fiber has a plane of 360°/N including an inclined branching fiber-abutting plane inclined at an angle θ to the optical fiber axis and a light-coupling plane vertical to the abutting plane, each of the optical coupler parts is constructed by inserting the light branching-coupling optical fiber in an optical fiber-retaining hole of a block having the same plane as the branching fiber-abutting plane of the optical fiber and a light-coupling plane vertical to the abutting plane, and the branching fiber-abutting planes of the optical coupler parts are engaged with each other to construct a optical coupler.

Environmentally robust fiber optic coupler and method

A fiber optic coupler is formed by inserting a plurality of optical fibers into the longitudinal bore of a glass tube so that at least a portion of each fiber extends from at least one end of the tube. The midregion of the tube is collapsed onto the fibers, uncollapsed bore portions remaining at the tube end regions. Each bore portion is connected to the tube end surface by a funnel that facilitates the fiber insertion step. The central portion of the midregion is stretched to reduce the diameter thereof. In a first embodiment, glue is applied to the funnel. Before the glue is cured, a sufficient period of time is allowed to elapse to permit said glue to flow by capillary action between the fibers and the adjacent portion of the wall of the bore portion. The glue flows at least 3 mm into the bore portion beyond the bottom of the funnel. The glue that flows by capillary action fails to completely surround the fibers with glue. The glue is then cured. In a second embodiment, a hollow filament is inserted into the uncollapsed bore portion and a vacuum is applied to the filament. Glue, which is applied to the funnel, is drawn into the uncollapsed bore portion due to the evacuated condition thereof, thus filling the uncollapsed bore portion to the desired level.

Polarization-maintaining optical coupler and method of making the same

Embodiments of the present invention provide an optical coupler. The optical coupler includes a fused optical coupling region made of part of a first and a second single-mode (SM) fiber, with a portion of the second SM fiber being a pigtail fiber on a first side of the fused optical coupling region; and a first and a second polarization-maintaining (PM) fiber on the first side and a second side of the fused optical coupling region respectively. Methods of making the optical coupler and system that utilizes the optical coupler are also provided.

Optical-fiber directional coupler using boron oxide as interstitial material

An evanescent-field coupler for an optical fiber having a core and a cladding forming a guiding region located sufficiently close to the surface of the fiber along a selected length thereof to allow evanescent-field coupling of an optical signal from the guiding region to an optical fiber or other device outside the guiding region, the cladding consisting essentially of silica, the coupler comprising a vitreous layer of amorphous boron oxide or a boron oxide compound fused to the cladding and having an index of refraction substantially matching the index of refraction of the cladding.

Directional coupler

Fiber optic directional coupler

ABSTRACT A fiber optic directional coupler comprising a pair of strands of single mode optical fiber having biconical tapers whereby the electromagnetic field within the fibers extend virtually to the cladding outside surface, the strands in the region of the tapers being bent in opposite directions and positioned with their cladding in contact over a length of the waist of the tapers, the cladding in contact being narrowed on one side, flat, and polished, whereby the field is coupled from one strand to the other.

Optical coupler housing

The present invention relates to a housing (10) for an optical coupler (12). The housing includes a primary protective body (14) having a receiving space therein wherein the coupled portion of the coupler is positioned. A support material (30) at least partially about the coupled portion (26) of the coupler (12) extends in the receiving space to the primary protective body. The sup-port material is resilient and has an index of refraction less than that of the coupled portion of the coupler.

Fusing type optical coupler

Reflectometer for monitoring the fabrication of optical fiber couples

내용 없음. No content.

Directional coupler

Adjuster for differnce in phase constant of fiber type single mode directional coupler

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Thermo-optically tunable fused fiber coupler

본 발명은 열 광학 가변 광커플러에 관한 것으로서, 제1코어와 제1클래드로 된 제1광섬유과, 제2코어와 제2클래드로 된 제2광섬유가 일부 상호 융합된 융합 커플링 영역을 갖게 형성되되 융합 커플링 영역은 제1클래드와 제2클래드가 상호 융합되는 공통 클래드 내에 제1코어와 제2코어로부터 각각 연장되되 인장에 의해 제1코어와 제2코어 보다 외경이 작게 형성된 제1 및 제2 테이퍼 코어를 갖는 커플링 본체와, 융합 커플링 영역 외측에 온도에 따라 굴절율이 가변되는 소재로 형성된 버퍼층과, 버퍼층 외측에서 버퍼층에 열을 인가할 수 있도록 된 히터를 구비한다. 이러한 본 발명에 따른 열 광학 가변 광커플러에 의하면, 히터에 의해 인가되는 열에 의해 출력광의 파장을 가변시킬 수 있다. 광커플러, 열광학, 히터 The present invention relates to a thermo-optic variable optical coupler, wherein the first optical fiber of the first core and the first clad and the second optical fiber of the second core and the second clad are formed to have a fusion coupling region in which they are partially fused together. The fusion coupling region extends from the first core and the second core in a common clad in which the first clad and the second clad are fused to each other, and the first and second cores having a smaller outer diameter than the first core and the second core by tension. A coupling body having a tapered core, a buffer layer formed of a material whose refractive index varies with temperature outside the fusion coupling region, and a heater configured to apply heat to the buffer layer outside the buffer layer. According to the thermo-optical variable optical coupler according to the present invention, the wavelength of the output light can be varied by the heat applied by the heater. Optocouplers, Thermo Optics, Heaters

Low bend loss single mode optical fiber

光纤包括：(i)纤芯区域(10)，包括外半径r 1 且3.0≤r 1 ≤7.0微米和相对折射率Δ 1最大值 且0.32％≤Δ 1最大值 ≤0.5％；(b)凹陷折射率包层区域(30)，其围绕纤芯区域且包括外半径r 3 和相对折射率Δ 3 小于‑0.2％，和凹槽体积V 3 ，其中45％Δ‑微米 2 ≤│V 3 │≤200％Δ‑微米 2 ；(c)第一外包层区域(40)，其围绕凹陷折射率包层区域(30)且包括相对折射率Δ 4 和外半径r 4 ；和(d)第二外包层区域(60)，其包括5‑20重量％氧化钛，相对折射率Δ 5 和厚度T M ，其中3微米≤T M ≤30微米，和外半径r 5 ≤65微米；光纤具有模场直径MFD 1550 且8微米≤MFD 1550 ≤10.5微米，当绕着2.5mm半径心轴弯曲1圈时截止波长<1550nm，和当使用包括2.5mm半径心轴时1550nm处的弯曲损耗≤1.0dB/圈。

Acousto-optic frequency shifter

내용 없음.

A method of making a photonic crystal fibre

길이 방향의 홀(130,140) 배열을 갖는 벌크재와 도파 코어(135)로 구성되는 광자결정 광섬유(photonic crystal fibre)에 있어서, 광섬유가 길이 방향축에 대해 최대 2배의 회전 대칭성을 가지며, 이 광섬유는 복굴절성이다. In a photonic crystal fiber composed of a bulk material having an array of holes 130 and 140 in the longitudinal direction and a waveguide core 135, the optical fiber has rotational symmetry of up to twice the longitudinal axis, and the optical fiber Is birefringent.

Optical fiber amplifier and coupler

본 발명은 첫번째 및 두번째 광섬유 커플러를 가지는 광섬유 커플러와 결합되는 이득 섬유가 함유된 광섬유 증폭기에 관한 것이다. 상기 커플러 섬유를 그 길이를 따라서 함께 용융하여 파장 λs의 대부분의 광선파우어가 상기 섬유 사이에 커플러되는 파장 의존 커플링 영역을 형성하고, 상기 첫번째 섬유로 유입된 파장 λp의 대부분의 광선파우어는 상기 첫번째 섬유에 잔존한다. 상기 첫번째 커플러 섬유의 모드 영역 직경은 실제적으로 상기 이득 섬유의 것과 부합되고, 상기 두번째 커플러 섬유의 것보다 작다. 상기 첫번째 커플러 섬유의 한쪽 말단부는 상기 이득 섬유와 접속된다. 전송 섬유를 상기 이득 섬유와 접속시키고, 레이져 다이오는 파장 λp의 펌핑 광선을 상기 첫번째 커플러 섬유로 유입시킨다. 상기 광섬유 커플러는 바람직하게 신장된 유리 매트릭스의 몸체를 통해서 확장된 적어도 첫번째 및 두번째 커플러 섬유를 포함한다. 상기 유리 매트릭스는 크래딩 섬유의 것보다는 작은 굴절률 n s 를 가진다. 상기 섬유는 상기 유리 매트릭스의 중간영역을 따라 함께 용융되고, 상기 광섬유의 코아는 상기 말단면에서 보다 상기 중간영역의 중심 부위에 더 근접하게 위치해 있어서 상기 커플링 영역을 형성한다. The present invention relates to an optical fiber amplifier containing gain fibers coupled with an optical fiber coupler having first and second optical fiber couplers. The coupler fibers are melted together along their length to form a wavelength dependent coupling region where most of the light powers of wavelength lambda s are coupled between the fibers, and most of the light powers of wavelength lambda p introduced into the first fiber are Remaining in the fiber. The mode area diameter of the first coupler fiber actually matches that of the gain fiber and is smaller than that of the second coupler fiber. One end of the first coupler fiber is connected to the gain fiber. The transmission fiber is connected with the gain fiber and the laser diode introduces pumped light rays of wavelength lambda p into the first coupler fiber. The optical fiber coupler preferably comprises at least first and second coupler fibers extending through the body of elongated glass matrix. The glass matrix has a refractive index n s less than that of the cladding fibers. The fibers melt together along the middle region of the glass matrix, and the core of the optical fiber is located closer to the center portion of the middle region than at the distal face to form the coupling region.

Multi-core fibre for optical pumping device and method for its manufacture; optical pumping device; fibre laser and fibre amplifier

FIELD: machine building. ^ SUBSTANCE: multi-core fibre is obtained by insertion of many optical fibres into the mounting element and integration by heating. At that, mounting element is a capillary tube with many holes and it is made from the material that has melting point which is lower than melting point of optical fibres which are inserted into the holes made in the mounting element. Some part of capillary tube with many holes is swaged for formation of swaged section. Capillary tube with many holes and optic fibres are integrated in the swaged section. ^ EFFECT: improving characteristics and reducing the deformation of optic fibres. ^ 7 cl, 4 dwg, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 439 627 (13) C2 (51) МПК G02B 6/036 (2006.01) H01S 3/06 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2009139250/28, 24.04.2008 (24) Дата начала отсчета срока действия патента: 24.04.2008 (72) Автор(ы): ТАНИГАВА Содзи (JP), НАКАИ Митихиро (JP) (73) Патентообладатель(и): ФУДЗИКУРА ЛТД. (JP) R U Приоритет(ы): (30) Конвенционный приоритет: 27.04.2007 JP 2007-120271 (43) Дата публикации заявки: 27.04.2011 Бюл. № 12 2 4 3 9 6 2 7 (45) Опубликовано: 10.01.2012 Бюл. № 1 2 4 3 9 6 2 7 R U (85) Дата начала рассмотрения заявки PCT на национальной фазе: 23.10.2009 C 2 C 2 (56) Список документов, цитированных в отчете о поиске: Hironori TANAKA et al., Tako Capillary о Mochita Sekkei Jiyudo no Takai Pomp Combiner», Proceedings of the IEICE General Conference, vol.2006 Nen Tsushin, №2, 08.03.2006, с.513. JP 3023241 A, 31.01.1991. JP 2007165822 A, 28.06.2007. DE 10357000 A1, 14.07.2005. (86) Заявка PCT: JP 2008/057915 (24.04.2008) (87) Публикация заявки РСТ: WO 2008/136344 (13.11.2008) Адрес для переписки: 129090, Москва, ул. Б.Спасская, 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", пат.пов. Ю.Д.Кузнецову, рег. № 595 (54) МНОГОСЕРДЦЕВИННОЕ ВОЛОКНО ДЛЯ УСТРОЙСТВА ОПТИЧЕСКОЙ НАКАЧКИ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ, ...

The manufacturing of fibre-optic component

用于制造融接的双锥型光纤耦合器的装置，包括具有纵向狭槽的中空加热炉夹持装置，使至少两根经适当预处理的光纤保持紧密并排接触。夹持装置由电机驱动，使光纤作相对横向运动，经狭槽进入炉中和从炉中移出。电源使炉加热，再使光纤段加热，直到温度足以使光纤段触接在一起。与夹持装置装在一起的拉伸装置，纵向拉伸处于加热炉中的光纤，使每一根已融接的光纤变成双锥型，从而形成一个耦合器。

Fabrication of multiplexing and demultiplexing single-mode fiber optic couplers

멀티플렉싱 및 디멀티플렉싱 단일모드 광섬유 광 결합기는, 보호 가소성 재킷으로 스트립되고 오염되지 않으며, 서로 접촉상태로 유지된, 두개의 단일모드 광섬유를 정렬하고, 다음, 소정의 용융 프로파일을 얻기 위하여 상기의 광섬유들을 용융시키고, 그리고 파장 주기 및 편광 위상 사이의 정합점을 획득하기 위하여 상기 용융된 광섬유를 신장시킴에 의하여 제조된다. 상기 신장 공정은 원하는 멀티플렉싱 및 디멀티플렉싱 결합기를 형성하는데 필요한 정밀한 정합점을 획득하는데 필요한 만큼 중지 및 재개된다.

Production of photo branching and coupling device

asymmetric optical fiber coupler

본 발명은 직경이 상호 다른 광섬유가 접합된 구조로 된 비대칭 광섬유 커플러에 관한 것으로서, 제1코어와, 제1코어를 감싸는 제1클래드로 되어 일정길이 연장된 메인 광섬유와, 메인 광섬유의 중간 부분에서 제1코어와 경사지게 접합되며 제1코어보다 작은 외경을 갖는 제2코어와 제2코어를 감싸는 제2클래드로 형성된 사이드 광섬유를 구비한다. 이러한 비대칭 광섬유 커플러에 의하면, 순방향 결합효율은 높일 수 있고, 역방향 결합효율을 낮출 수 있는 장점을 제공한다. 플라스틱 광섬유, 비대칭, 광커플러, 광센서 The present invention relates to an asymmetric optical fiber coupler having a structure in which optical fibers of different diameters are bonded to each other, wherein the first core, the first cladding surrounding the first core, and the main optical fiber extended by a predetermined length, And a side optical fiber formed of a second core having an outer diameter smaller than that of the first core and a second cladding surrounding the second core. According to the asymmetric optical fiber coupler, the forward coupling efficiency can be increased, and the reverse coupling efficiency can be lowered. Plastic Optical Fiber, Asymmetrical, Optocouplers, Optical Sensors

Method for fabrication of fused fibre devices

Method and apparatus for fabricating fused optical fibre devices includes a furnace provided with an electric heating element. A heat-distributing insert is provided within the heating element, the heating element and the insert being sized and shaped to define a heating chamber for an optical fibre arrangement. The method includes passing electric current through the heating element, and supplying and maintaining an inert atmosphere within the heating chamber.

Polarization conversion element

Mach-zehnder interferometric devices with composite fibers

一种马赫－策恩德波长选择器,用一根或多根复合光纤制成,每根复合光纤包含一相移区,其具有一有效折射率,被拼接在有效折射率不同的耦合区之间。每根这样的复合光纤所产生的光程长度差或相位延迟是相移区长度的线性函数。

Photo-crystal fiber coupler and method for fabricating thereof

본 발명은 광자결정 광섬유의 고유한 광학적 성질을 유지하며 빛을 분배할 수 있는 광자결정 광섬유를 이용한 커플러 및 그 제조방법에 관한 것이다. 광자결정 광섬유 커플러는 각각 코어부 및 상기 코어부를 감싸면서 형성된 길이 방향의 다수의 구멍을 포함하는 클래드부를 구비하는 적어도 둘 이상의 광자결정 광섬유와, 상기 광자결정 광섬유의 길이방향 일부를 따라 형성된 적어도 하나의 커플링 영역을 갖는 것을 특징으로 한다. 또한, 광자결정 광섬유 커플러의 제조방법이 개시되어 있다. The present invention relates to a coupler using a photonic crystal optical fiber capable of distributing light while maintaining inherent optical properties of the photonic crystal optical fiber, and a method of manufacturing the same. The photonic crystal optical fiber coupler includes at least two photonic crystal optical fibers each having a core portion and a clad portion including a plurality of longitudinal holes formed around the core portion, and at least one formed along a longitudinal portion of the photonic crystal optical fiber. It is characterized by having a coupling area. Also disclosed is a method of manufacturing a photonic crystal optical fiber coupler.

Ultra high power fiber laser system with multimode-multimode fiber coupler

Polarization-maintaining optical fibers for coupler fabrication

Polarization-maintaining coupler is made by a biconically-tapered-fused process from two short lengths of an optical fiber, each having a small, oval stress-applying region that substantially contacts the core. The area of the stress-applying region of the optical fiber is less than 10 percent, preferably less than 2 percent, that of the optical fiber and preferably is contiguous with the core. Couplers of highest quality are made from quartz glass fibers having a birefringence between 1 and 3×10 -4 . It is believed that the principal axes of the oval stress-applying regions of those couplers of highest quality have been collinear or parallel. To permit a coupler to be handled, it can be mounted on a quartz glass substrate with the coupler suspended in air and then potted in a cured elastomer.

Athermal optical device

Fibre-optical sensor and a sensor device containing the former

A fibre-optical sensor is specified in which an external influencing variable acting on the sensor is detected by the fact that it produces a detectable coupling of two modes or polarisations in the fibre. In one illustrative embodiment of the invention (Figure 10), an optical fibre is constructed in one or a number of successive fibre sections in such a manner that a change in the influencing variable, for example pressure, magnetic field or temperature, directly influences the mode coupling in the relevant section. In a second illustrative embodiment, the influencing variable acts in one or a number of successive fibre sections via a means deforming the relevant fibre section in a wave-like manner in a longitudinal direction, the mode coupling in each case only occurring with a particular length of the light guided in the fibre. Thus, the effect of the influencing variable on a fibre-optical sensor having several successive sensor sections can be spatially resolved by evaluating the wavelength at which the mode coupling is changed by the influencing variable. The optical fibre can either have a coaxial fibre structure (Figure 10) having two closely adjacent light-wave-guiding regions, in which the modes coupling with one another are guided in different optical wave guide ranges (1, 3) of the same fibre, or it can be a normal monomode- or multimode-fibre with a single wavelength range in which both modes or polarisations coupled to one another are guided. <IMAGE>

Passive fiber-optic network

FIELD: telecommunications; passive loop-architecture optical circuits. SUBSTANCE: proposed passive fiber-optic network has unidirectional fiber-optic loop, N directional couplers disposed at different points of loop, communication center, and plurality of subscriber points. Communication-center transmitter is optically coupled with fiber-optic loop sending end and receiver, with its receiving end. Transmitter and receiver of each subscriber point are optically coupled with fiber-optic loop through respective directional coupler inserted in fiber-optic loop. Directional couplers, from first to last ones, have rising branching coefficients from sending to receiving ends of fiber-optic loop at transmitter radiation wavelength of communication center and reducing branching coefficients on transmitter radiation wavelength of any subscriber point. Transmission is conducted in network in two streams: from communication center to subscriber points and from the latter to communication center. EFFECT: enhanced quantity of subscriber points in network, enlarged amount of hardware used in telecommunications. 4 cl, 5 dwg ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß RU (19) (11) 2 310 278 (13) C1 (51) ÌÏÊ H04B 10/12 (2006.01) G02B 6/10 (2006.01) G02B 6/28 (2006.01) ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÎÏÈÑÀÍÈÅ ÈÇÎÁÐÅÒÅÍÈß Ê ÏÀÒÅÍÒÓ (21), (22) Çà âêà: 2006102326/09, 27.01.2006 (72) Àâòîð(û): Ïîïîâ Àëåêñàíäð Ãåííàäüåâè÷ (RU) (24) Äàòà íà÷àëà îòñ÷åòà ñðîêà äåéñòâè ïàòåíòà: 27.01.2006 (73) Ïàòåíòîîáëàäàòåëü(è): Ïîïîâ Àëåêñàíäð Ãåííàäüåâè÷ (RU) (45) Îïóáëèêîâàíî: 10.11.2007 Áþë. ¹ 31 R U Àäðåñ äë ïåðåïèñêè: 111024, Ìîñêâà, ïð-ä Ýíòóçèàñòîâ, 19á, êâ.35, À.Ã. Ïîïîâó 2 3 1 0 2 7 8 êàæäîãî àáîíåíòñêîãî óçëà îïòè÷åñêè ñâ çàíû ñ âîëîêîííî-îïòè÷åñêîé ïåòëåé ÷åðåç ñîîòâåòñòâóþùèé íàïðàâëåííûé îòâåòâèòåëü, âêëþ÷åííûé â âîëîêîííî-îïòè÷åñêóþ ïåòëþ. Íàïðàâëåííûå îòâåòâèòåëè îò ïåðâîãî ê ïîñëåäíåìó, â ïîð äêå èõ ðàñïîëîæåíè îò íà÷àëà 5 ê êîíöó âîëîêîííî-îïòè÷åñêîé ïåòëè ...

Production of photo distributor

Narrow band mach-zehnder filter

一种马赫-策德尔滤波器，包括一个把输入信号 等分成N个输出信号的输入耦合器，其中N＞2和 一个把N个光信号组合成一个输出信号的信号组合 耦合器；它进一步包括用于把来自输入耦合器的N 个输出连接到信号组合耦合器的N根光波导光纤； N根光纤的每一根使经过其间传播的光经受一个延 迟，该延迟不同于经过其它任一光纤而传播的光所经 受的延迟。该马赫-策德尔滤波器比以往的滤波器 每级呈现更高的细度，细度是相邻峰的波长间隔与峰 宽度之比。

Fused fiber optic coupler arrangement and method for use thereof

Exemplary embodiments of an article of manufacture and method according to the present disclosure are provided. For example, a first multi-clad fiber arrangement can be provided that comprises a first core and at least one first cladding which is structured to propagate at least one first electro-magnetic radiation therethrough. A second multi-clad fiber arrangement can also be provided that comprises a second core and at least one second cladding which is structured to propagate at least one second electro-magnetic radiation therethrough. Further, at least one portion can be provided in which the first and second claddings are fused to one another.

Adjustable optical coupler using photosensitive glass

광커플러(10)는 커플링 영역(12)에서 서로 인접한 두 섬유(20, 30)를 갖는다. 상기 두 섬유중 하나는 게르마니아와 같은 감광성 유리로 도핑된 클래드를 갖는다. 상기 감광성 유리는 적당한 복사선에 노출되어 섬유의 굴절률을 변경시키고 커플러(110)를 선택된 커플링 주파수로 조정한다.

Arrangement for automated fabrication of fiber optic devices

Fiber optic devices are manufactured in an automated environment using a combination of clamps to secure the optical fibers and movable gripping devices that transport the optical fiber during the fabrication process while maintaining control of the ends of the optical fibers. An optical fiber from a spool is removed by a despooling arm having a gripping device, and moveable grippers thread the optical fiber into a set of clamps and place the end of the optical fiber in a clamp designed to splice the fiber optic end to a lead of a testing device. The fiber optic device is formed by dynamically controlling the heating and pulling process based on detected coupling ratios, and hermetically sealed while secured within the clamps. The sealed fiber optic device is moved for testing or packaging using a transport arm having a series of clamps to maintain the position of the fiber optic device and the ends of the leads of the fiber optic device.

Polarization retaining fiber optic coupler and method

To fabricate polarization retaining couplers, the fibers must be kept untwisted and must be maintained parallel to one another, and the major axes of the polavitation-retaining single mode (PRSM) (115,116) fibers must be maintained substantially parallel to one another. It is noted that this orientation includes that orientation wherein the major axes are substantially coaxial. The method of the present invention is characterized in that the fiber coating material is utilized to facilitate the alignment of the major axes of the fibers. In a first described embodiment, each fiber is provided with a rectangularly shaped coating (117,118), and the two larger flattened sides of the coating are specifically oriented with respect to the major and minor axes of the PRSM fiber therein. Cores (141) and (143) of optical fibers (115) and (116), respectively, are elliptically-shaped, and the minor axis of each core is parallel to the long flat sides of the rectangularly-shaped coating. In one embodiment, tube (110) is heated and collapsed onto fibers (115) and (116) in a step that is separate from the step of stretching the midregion of tube (110). The flame from burner (129) is directed onto midregion (128) to heat glass tube (110) to its softening point. Burner (129) may remain stationary, or it may traverse midregion (128) in the direction toward vacuum source (126) as shown by arrow (130). It is an optional feature of the tube collapse step to apply a vacuum source to both hollow filaments (121) and (122), in which case the direction of burner traverse is immaterial. Midregion (128) becomes a solid region that is preferably free of air lines, bubbles, or the like.

Chlorine-doped optical component

본 발명은 각기 코아 및 클래딩을 가진 첫번째 및 두번째 싱글 모드 광섬유가 그 길이의 일부를 따라 함께 용융되어 커플링 영역을 형성하는 형태의 광섬유 커플러에 관한 것이다. The present invention relates to an optical fiber coupler in which the first and second single mode optical fibers, each having a core and a cladding, are melted together along a portion of their length to form a coupling region. 섬유 직경은 커플링 영역에서 섬유의 나머지 부분보다 더 적다. 두번째 섬유의 클래딩은 첫번째 섬유 클래딩의 굴절율 n 2 보다 더 큰 값으로 그 굴절율을 증가시키기에 충분한 양의 염소를 함유한다. The fiber diameter is smaller than the rest of the fiber in the coupling region. The cladding of the second fiber contains an amount of chlorine sufficient to increase its refractive index to a value greater than the refractive index n 2 of the first fiber cladding.

Optical fused couplers

Reinforced multicore optical fiber coupler

本发明为多芯光纤耦合器的加固型外壳，其中的 多芯光纤具有许多根互相平行地设置并且一起被一 公共的覆层树脂所包覆的光纤丝。把多芯光纤的轴 向覆层树脂部分去除，以露出光纤丝的玻璃部分。接 着对露出的玻璃部分进行融化和拉伸。每根光纤丝 在轴线方向上的玻璃部分的融化及拉伸部分两侧的 未拉伸部分分别被置入加固型外壳上形成的多个槽 中。上述的加固型外壳由线膨胀系数大致与石英相 同的材料制成。

OPTICAL FIBER SET ASSOCIATED WITH ONE OR MORE INPUT COUPLERS AND ITS PRODUCTION PROCESS

La présente invention concerne un ensemble de fibres optiques constituant un guide d'ondes, comprenant une ligne de transmission optique et au moins un coupleur d'entrée couplé optiquement à celle-ci. La ligne de transmission et le coupleur d'entrée sont des guides d'ondes à fibre unique comportant chacune un coeur d'indice de réfraction relativement élevé et un revêtement optique entourant ledit coeur et d'indice de réfraction inférieur. Une partie du revêtement optique du coupleur est réunie par fusion à une partie du revêtement du guide d'ondes transmetteur de maniéré à former un élément de couplage, commun à partir des deux guides d'ondes. Application à la transmission de signaux d'information provenant d'un groupe de terminaux à un autre groupe éloigné.

PROCESS FOR MANUFACTURING A MULTIFIBRE OPTICAL DISTRIBUTOR AND OPTICAL DISTRIBUTOR OBTAINED ACCORDING TO SAID METHOD

Le répartiteur optique multifibre comporte N fibres périphériques et une fibre centrale couplées optiquement. Le procédé de fabrication selon l'invention d'un tel répartiteur est caractérisé en ce qu'il consiste par étirage d'une préforme primaire composite à réaliser un conducteur multiguide dont les guides sont des fibres élémentaires cylindriques noyées parallèlement dans une gaine de couplage optique et mécanique, définissent les fibres du répartiteur et présentent des caractéristiques opto-géométriques pour leur couplage optique sur une longueur définie de ce conducteur, sectionné en conséquence. Application: coupleur optique. The multifiber optical splitter has N peripheral fibers and a central fiber optically coupled. The method of manufacturing according to the invention of such a distributor is characterized in that it consists by stretching of a composite primary preform in producing a multi-guide conductor whose guides are elementary cylindrical fibers embedded in parallel in an optical coupling sheath. and mechanical, define the fibers of the distributor and have opto-geometric characteristics for their optical coupling over a defined length of this conductor, cut accordingly. Application: optical coupler.

Optical fibre switching device - uses material whose refractive index varies with temp. to control coupling between two fibres by peltier effect heating element

The switching device comprises a cell containing a substance whose refractive index varies with temp. The refractive index is different from that of the core of the optical fibres used. A Peltier effect element is positioned in contact with the walls of the cell in order to vary the temp., thus affecting the refractive index. A thermistor may also be included. Each optical fibre is curved as it passes through the cell and each is twisted w.r.t. the bundle. The external surface of the curve the outer sleeve of the fibre is removed, exposing the core. The coupling which occurs between the two fibres thus varies according to the refractive index of the material, since internal reflection is varied at the boundary between the fibre cores and the material. The variable refractive index material is taken from the group containing oil of vaseline, carbon tetrachloride and silicone resins.

OPTICAL FIBER COUPLER AND OPTICAL FIBER THEREFOR

OPTICAL FIBER TERMINATION ARRANGEMENT

Invention concernant un agencement de raccordement de fibres optiques. Raccordement de fibres optiques qui comprend un premier groupe d'au moins deux fibres optiques dont les portions terminale disposées côte-à-côte sont mutuellement réunies par fusion, la section desdites portions terminales allant en décroissant vers les faces terminales desdites fibres, et un second groupe d'au moins une autre fibre, disposée de façon que sa portion terminale soit parallèle aux portions terminales des fibres dudit premier groupe, la face terminale de la fibre ou desdites autres fibres étant réunie par fusion à la face terminale des fibres dudit premier groupe. Application à tous les appareils comportant des fibres à raccorder ensemble. Invention relating to an arrangement for connecting optical fibers. Optical fiber connection which comprises a first group of at least two optical fibers, the end portions of which arranged side by side are mutually joined by fusion, the section of said end portions decreasing towards the end faces of said fibers, and a second group of at least one other fiber, arranged so that its end portion is parallel to the end portions of the fibers of said first group, the end face of the fiber or of said other fibers being joined by fusion to the end face of the fibers of said first group . Application to all devices comprising fibers to be connected together.

LOW ATTENUATION OF ACCESS COUPLERS FOR MULTIMODES OPTICAL FIBERS

L'invention concerne un coupleur à faible atténuation d'accès pour fibres optiques multimodes. Le coupleur 1 comprend une première fibre optique 2 et une seconde fibre optique 3 comportant chacune un tronçon effilé biconique 6, lesdits tronçons étant torsadés l'un autour de l'autre et soudés ensemble par fusion des fibres sur une longueur déterminée 1. Application au couplage de fibres optiques multimodes à saut d'indice ou à gradient d'indice. A low attenuation access coupler for multimode optical fibers is provided. The coupler 1 comprises a first optical fiber 2 and a second optical fiber 3 each comprising a biconical tapered section 6, said sections being twisted around one another and welded together by fusion of the fibers over a determined length 1. Application to coupling of step-index or gradient-index multimode optical fibers.

Variable-ratio optical coupler for time-domain reflectometry

The coupler comprises two optical fibres (1,5) fused together over a coupling region (3) through which light injected into either fibre can be branched into the other. The fused portion is treated with a liquid or coating whose refractive index varies with a physical or chemical property of the medium in which the device is placed. The branches (51,52) of the subsidiary fibre may be terminated with mirrors (17) formed e.g. of a thin film of Au, Ag or Al applied to the free end, while the ends of the main fibre (1) are connected to an optical transmitter and receiver respectively.

Method of making fiber optic couplers

A fiber optic coupler is formed by providing a glass tube having a longitudinal aperture extending therethrough. Protective coating is removed from a region of a first optical fiber intermediate the ends thereof. Protective coating is removed from an end region of at least one other optical fiber. The coated portion of the first fiber is threaded through the tube until the uncoated region thereof is near the tube end. The uncoated region of the second fiber is placed adjacent that of the first fiber, and both uncoated regions are simultaneously fed into the tube aperture. After the threading operation has continued until the uncoated regions extend through the midregion of the tube, the midregion is heated to collapse it about the fibers, and the central portion of the midregion is drawn to reduce the diameter thereof over a predetermined length.

Patent FR2507787B1

METHOD OF COUPLING BETWEEN A MULTI-COARSE OPTICAL FIBER AND MULTIPLE MONOCOER OPTIC FIBERS

La présente invention concerne un procédé de couplage entre d'une part une fibre optique multicoeurs (1) comprenant N coeurs optiques (2) (N >= 4), parallèles les uns aux autres et noyés dans une gaine optique commune (3), et d'autre part une pluralité de fibres optiques monocoeurs (4), comprenant chacune un coeur optique (5), entouré d'une gaine optique (6). Selon ce procédé, le couplage est réparti en P niveaux de couplage (7, 8; 7', 8') (2 =<P< N) comprenant chacun au moins deux fibres monocoeurs (4) et décalés longitudinalement les uns par rapports aux autres le long de la fibre multicoeurs (1). Les niveaux (7, 8; 7', 8') sont tels que chaque fibre (4) y appartenant est disposée parallèlement à un coeur (2) de la fibre multicoeurs (1) et en regard de ce dernier, et est rendue solidaire de la gaine optique (3) de la fibre multicoeurs (1) de manière à réaliser un couplage latéral par ondes évanescentes. The present invention relates to a coupling method between, on the one hand, a multicore optical fiber (1) comprising N optical cores (2) (N> = 4), parallel to each other and embedded in a common optical cladding (3), and on the other hand a plurality of single-core optical fibers (4), each comprising an optical core (5), surrounded by an optical cladding (6). According to this method, the coupling is distributed into P coupling levels (7, 8; 7 ', 8') (2 = <P <N) each comprising at least two single-core fibers (4) and offset longitudinally with respect to each other. others along the multicore fiber (1). The levels (7, 8; 7 ', 8') are such that each fiber (4) belonging to them is arranged parallel to a core (2) of the multi-core fiber (1) and opposite the latter, and is made integral of the optical cladding (3) of the multicore fiber (1) so as to achieve lateral coupling by evanescent waves.

POWER DIVIDER FOR FIBER OPTIC

INTEGRATED OPTICAL DEVICE FOR SEPARATING POLARIZED COMPONENTS FROM A GUIDED ELECTROMAGNETIC FIELD AND METHOD OF MAKING THE DEVICE

L'invention concerne un dispositif d'optique intégrée permettant de séparer les composantes polarisées d'un champ électromagnétique guidé qui comporte pour cela un coupleur comprenant une première 1, 6, 7 et une deuxième 2, 7, 8 structures de guidage d'ondes électromagnétiques dont les coeurs 1, 2 sont espacés par un intervalle prédéterminé de manière à permettre un couplage de l'énergie de l'une des structures vers l'autre, ces structures admettant des modes guidés et ayant des indices effectifs différents pour une première composante polarisée du champ électromagnétique et égaux pour une deuxième composante polarisée de ce champ électromagnétique, l'intervalle entre ces coeurs étant constant sur une distance également prédéterminée L au bout de laquelle un transfert total de l'énergie a eu lieu pour la deuxième composante polarisée, cet intervalle augmentant au bout de cette distance L afin de pouvoir récupérer sur chacune de ces structures l'une des composantes polarisées du champ. Application à l'optique intégrée. The invention relates to an integrated optical device for separating the polarized components of a guided electromagnetic field which comprises for this a coupler comprising a first 1, 6, 7 and a second 2, 7, 8 waveguiding structures. electromagnetic whose cores 1, 2 are spaced apart by a predetermined interval so as to allow coupling of energy from one of the structures to the other, these structures admitting guided modes and having different effective indices for a first component polarized of the electromagnetic field and equal for a second polarized component of this electromagnetic field, the interval between these cores being constant over a also predetermined distance L at the end of which a total transfer of energy has taken place for the second polarized component, this interval increasing at the end of this distance L in order to be able to recover from each of these structures one of the polarized ...

Patent FR2524154A1

LA PRESENTE INVENTION CONCERNE UN PROCEDE DE FABRICATION D'UN RACCORD DE FIBRES OPTIQUES A FAIBLES PERTES DE FORME BICONIQUE. ELLE PREVOIT ESSENTIELLEMENT LE TORSADAGE DES FIBRES ET LA FORMATION D'UNE REGION DE FORME BICONIQUE, PUIS L'ENLEVEMENT D'UNE PORTION DE CETTE REGION, APRES QUOI, LES DEUX PARTIES ADJACENTES A LA REGION ENLEVEE SONT SOUDEES ENTRE ELLES.

Optical coupler with optical isolator independent of polarisation

The optical isolator (8) serves to prevent the output of an interfering light at the incident end. The output ends of the two input fibres (1, 2) may be fused together along a predetermined length. In one version there are condensing lenses (10, 11) on either side of the isolator; in another there is one condensing lens prior to the isolator. The output fibre (3) may be connected to an erbium doped fibre and one input may be an excitation light while the other is a signal to be amplified by induced emission.

Optical tetragate coupler, method of manufacturing same and method of manufacturing guide of same coupler

Bidirectional T=connector for optical fibres - has two couplers allowing each transmitting-receiving station to be interconnected on common optical bus

The bi-directional optical 'T' is for use in connecting a transmitting and receiving station into an optic-fibre bus. The 'T' overcomes problems of attenuation and parasitic signal generation normally encountered. The arrangement is based on the use of primary couplers (3) linking directly with the bus (2) and a second, preferably 3db, coupler interconnecting the transmit and receive station (E.R) into the primary. The primary coupler consists of an optical channel set in parallel with a section of the bus. This parallel channel has two terminals (8,9) which transmit and receive into the two terminations of a split channel in the second coupler. This in turn splits at the local station into two arms terminating at the station receive and transmit points. Both couplers are symmetrically constructed.

METHOD OF COUPLING BETWEEN A MULTI-CORE OPTICAL FIBER AND A PLURALITY OF SINGLE-CORE OPTICAL FIBERS